[all-commits] [llvm/llvm-project] ef2a10: [clang][bytecode] Start implementing __builtin_bit...

[Timm Baeder via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ef2a104c94a8e789a86d807509faf020d300da59
      https://github.com/llvm/llvm-project/commit/ef2a104c94a8e789a86d807509faf020d300da59
  Author: Timm Baeder <tbaeder at redhat.com>
  Date:   2024-10-31 (Thu, 31 Oct 2024)

  Changed paths:
    M clang/lib/AST/ByteCode/Boolean.h
    M clang/lib/AST/ByteCode/Compiler.cpp
    M clang/lib/AST/ByteCode/Compiler.h
    M clang/lib/AST/ByteCode/Floating.h
    M clang/lib/AST/ByteCode/Integral.h
    M clang/lib/AST/ByteCode/IntegralAP.h
    M clang/lib/AST/ByteCode/Interp.cpp
    M clang/lib/AST/ByteCode/Interp.h
    M clang/lib/AST/ByteCode/InterpBuiltin.cpp
    A clang/lib/AST/ByteCode/InterpBuiltinBitCast.cpp
    A clang/lib/AST/ByteCode/InterpBuiltinBitCast.h
    M clang/lib/AST/ByteCode/Opcodes.td
    M clang/lib/AST/CMakeLists.txt
    A clang/test/AST/ByteCode/builtin-bit-cast.cpp

  Log Message:
  -----------
  [clang][bytecode] Start implementing __builtin_bit_cast (#112126)

This is a subset of #68288, with hopefully narrower scope. It does not
support bitcasting to non-integral types yet.
Bitfields are supported, but only if they result in a full byte-sized
final buffer. It does not support casting from null-pointers yet or
casting from indeterminate bits.


The tests are from #68288 and partially from #74775.

The `BitcastBuffer` struct is currently always working in single bits,
but I plan to (try to) optimize this for the common full-byte case.



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